Github user zentol commented on the issue:
https://github.com/apache/flink/pull/4927
@StephanEwen
Regarding1) Curator 2.12 does not shade all of guava. This is the curation
relocation definition for guava:
```
<relocation>
<pattern>com.google</pattern>
<shadedPattern>org.apache.curator.shaded.com.google</shadedPattern>
<excludes>
<exclude>com.google.common.base.Function</exclude>
<exclude>com.google.common.base.Predicate</exclude>
<exclude>com.google.common.reflect.TypeToken</exclude>
</excludes>
</relocation>
```
The excluded classes are _not_ unused, as the `Function` class is used by
the `CuratorFramework`. So we still need to shade guava unfortunately.
As for 2), I'll take a look!
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